J'avo are creatures created from humans infected by the C-Virus in its "Primary" mechanism - direct administration; its counterpart, therefore, is the zombie, created by the virus' secondary mechanisms of airborne contamination. Derived from the Serbian word, đavo, meaning "devil", these creatures were named by the BSAA European Branch's R&D department.[1][2]

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In appearance, the J'avo are mostly human at a distance, though upon inspection their faces are horribly mutated. Their skin tones are often heavily discolored and faint blue-violet veins can be seen coursing through their faces. Their teeth often appear uneven, jagged and discolored. The most notable mutation are their large, rounded eyes with small pupils. The irises are filled with tiny specks and range from an off-white or pale yellow, to a darker yellow or brown.

The J'avo have more than two eyes, usually scattered along their face and forehead. These eyes appear in different patterns, positions and sizes such as large vertical eyes or clusters of four smaller eyes. The newly formed eye-sockets from their mutation cause the skin around the area to appear ruptured and even bleed profusely. Some J'avo found in Edonia cover up parts of their faces with bandages while those in Lanshiang sometimes wear decorative ceramic masks to cover their faces.

For all intents and purposes, the J'avo are fully-thinking and organized. They are able to communicate with each other through speech, signal to each other to retreat or move in for an attack, and even taunt their enemies. They are able to utilize close-range weapons such as combat knives or machetes as well as use firearms such as sub-machine guns, sniper rifles, and even rocket launchers.

All J'avo demonstrate highly effective regenerative capabilities. They are able to completely heal heavily-damaged limbs, muscle-tissue, and skin in mere moments. These regenerative capabilities, however, have the tendency of being extremely erratic and can cause spontaneous mutations depending on where the J'avo was damaged.[3] Interestingly, a J'avo is not limited to one mutation. It is possible for the same J'avo to experience multiple mutations such as a combination of a Noga-Let and the Ruka-Srp or the Noga-Oklop and the Ruka-Bedem. It is unknown what other combinations are possible. Special J'avo working directly with Neo Umbrella displayed the ability to mutate at will.

This mutation is triggered when the J'avo suffers heavy damage to the head. The creature spits a sticky, viscous fluid akin to webbing to constrain the player that can leave them vulnerable to other attacks whilst they try to free themselves.The name means "Head-Slime" in Serbian.

When the head is damaged enough, the J'avo will mutate in this manner. It appears the torso ruptures open, causing the beetle-like mandibles to extend. The mutated creature will use these mandibles to pick a player up into the air and either bisect them or devour them like an insect. The name could possibly translate to "Head-Laughter".

This variant comes from the head as the J'avo regenerates damage. Two different protrusions appear, one resembling the front/head of an insect, the other containing two small hook-like appendages. This type of mutation is very dangerous, as this mutation causes the J'avo to enter a berserk frenzy and will viciously attack the player until it is dead. The name could translate to "Head-Runner" or "Runaway head" from Serbian.

This mutation seems to come from the head. Several protrusions come in place as the J'avo regenerations, including something that resembles the stinger and abdomen of a bee or wasp or some sort. The creature emits a poisonous gas that damages and impairs vision. The name translates to "Head-Smoker"/"Head-Smoke"

The arm extends between the joints, causing the length to increase greatly as the hand mutates into a crude and brutal sickle. The end result is a limb that greatly resembles the arms of a praying mantis in the way it folds. Also can combine with Ruka-Bedem to form a deadly shield/sword combo. The name could possibly translate to "Sickle arm".[4]

The limb becomes more rounded, longer, and wider. It ends with three pincers that are capable of grappling a person. The newly mutated arm is able to stretch over great distances, bend around corners, and reach over cover. The name could possibly translate to "Arm to grab"/"catcher arm".[5][6] or "Arm-Capture"

The arm ruptures and splits apart as additional organic material grows. Thick muscle tissue covers the gaps from where the sections of the arm extends. The outside of the limb becomes covered with layered pieces of armoring. The J'avo will use this armor to shield their head and body from damage.Also can combine with Ruka-Srp to form a deadly shield/sword combo The name means "Arm-Wall".

Sprouting from the back, a new abdomen and thorax resembling that of an insect's replaces the legs and leaves the upper body dangling. This form of mutated J'avo seems to primarily move and attack by pouncing. The name translated from Serbian as "Leg-Work"

The lower torso explodes, causing a moth-like body to erupt. A pair of large wings, capable of carrying the human torso, appear as well as a long-tailed stinger that is capable of piercing an unwary target. The name translates to "Leg-Flight"

As the legs rupture, a new lower body grows in its place resembling an insect's thorax and abdomen, complete with large insect legs that are easily able to carry the weight of the J'avo and kick a player. The name could possibly translate to "Leg-hopper"/"Leg-Jumps"

The legs of the J'avo split and expand as they mutate. This ends with the upper-body being carried by a pair of legs covered with insect-like carapace with some human bones protruding. The new legs enable them to perform powerful jumping kicks that can knock a target down. The name translates as "Leg-Armor"

This mutation causes the J'avo's torso to mutate into a grotesque cocoon. This mutation has no attacks and simply tries to get as close to you as possible. Upon death it will explode and damage anything in the vicinity. If shot in the legs, it will kneel over and explode in place. The name translates as "Body-Explosions"

The J'avo writhes on the ground and sprouts several appendages and what appear to be moth wings though it is incapable of movement once it has transformed. This mutation will constantly emit a poisonous gas until it is destroyed.The name translates as "Body-Mist"

For all intents and purposes, in sense of mentality, J'avo have a human level of intelligence. They will use firearms (sub-machine guns, sniper rifles, rocket launchers), they will signal to each other and make use of communication and tactics to take out their enemies. If a J'avo has no means of long-range attack, they may attempt to hold on to a target to give one of their allies a chance to attack.[7] Some J'avo will instead use close-range weapons, namely machetes and combat knives. They are extremely persistent and extremely aggressive.

A J'avo begins its metamorphosis by first sealing itself within a Chrysalid.

One of the most dangerous aspects of the J'avo comes from their spontaneous mutations upon injury. There is essentially no truly safe spot to injure a J'avo at some points as anything can trigger a certain mutation, which could lead to severely worsening a situation. Their mutations are extremely dangerous and deadly when combined with their intelligent coordination. The only thing that should be more worrisome than their mutations is their evolution into a Chrysalid. In this pod-like state, the J'avo is vulnerable but when it hatches they become substantially more deadly.